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A183681 Number of (n+1)X(n+1) binary arrays with every 2X2 subblock nonsingular 1
6, 32, 256, 3472, 73344, 2542368, 140090240, 12503757968, 1787244586880, 411927241028352, 152442345546739968, 90819596095626887104, 86960426240537811217920, 133963874202574308172821152 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183688

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for 3X3

..0..1..0....0..1..1....1..0..1....1..1..0....1..1..1....1..1..1....0..1..0

..1..1..1....1..0..1....0..1..0....1..0..1....1..0..1....1..0..1....1..0..1

..0..1..0....1..1..1....1..0..1....1..1..0....1..1..1....1..1..0....1..1..1

CROSSREFS

Sequence in context: A221540 A331878 A121120 * A326985 A185386 A276351

Adjacent sequences:  A183678 A183679 A183680 * A183682 A183683 A183684

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2011

STATUS

approved

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Last modified May 31 09:01 EDT 2020. Contains 334747 sequences. (Running on oeis4.)